Phylum Platyhelminthes
What body symmetry do worms in Phylum Platyhelminthes show?
Bilateral symmetry (Can be divided into equal halves one way)
Which organ system (Associated with blood) are worms in Phylum Nematoda missing?
Circulatory System
What is the characteristic called where worms in Phylum Annelida have regularly repeating body segments?
Metamerism
All worms in Phylum Annelida/Nematoda/Platyhelminthes have this structure as a starting point to their digestive system.
Pharynx
What is the body plan of worms in Phylum Platyhelminthes?
Acoelomate (No true body cavity)
What is the body plan of worms in Phylum Nematoda?
Pseudocoelomates
What is the body plan of worms in Phylum Annelida?
Coelomate (True body cavity)
Please name two similarities that all worms in Phylum Platyhelminthes/Nematoda/Annelida have in terms of the reproductive system.
Separate sexes but also hermaphrodites
Fertilization can be internal or external
Parasitic worms in Phylum Platyhelminthes that embed themselves inside the organs of vertebrates belong to the Class _____.
Class Trematoda
What are the micro hair-like structures that extend from the intestinal cells of worms in Phylum Nematoda?
Microvilli
The reproductive system of worms in Phylum Annelida is unique because it produces _____ larvae.
Trochophore
Which of the three Phylum of worms do not have the trochophore larvae stage in terms of their reproductive system?
Phylum Nematoda and Platyhelminthes
Fully explain the feeding and digestion process of flatworms (Class Turbellaria)
Enzymes are used to start the digestion of food outside the body, the food enters the pharynx, then the food is absorbed by cells lining the digestive tract
How many major nerve cords do worms in Phylum Nematoda possess? Name at least one of these nerve cords.
Four major nerve cords
Dorsal/Ventral/Lateral nerve cord
Name the four ecological roles of worms in Phylum Annelida that we went over during class.
Parasitism, soil aeration, food source, nutrient cycling
What are the three germ layers possessed by all worms in Phylum Platyhelminthes/Nematoda/Annelida?
Ectoderm, Mesoderm, Endoderm
State the Class name tapeworms belong to then explain what their body part, proglottids, are.
Class Cestoda
Proglottids are detachable parts of tapeworms that contain nerve cells, flame cells, muscles, and reproductive organs
Explain the unique structure of the nervous/muscular system of worms in Phylum Nematoda.
Ventral/Dorsal nerve cords use extensions called muscle arms to reach out to each and every muscle cell.
Class Polychaeta
Setae (Hair-like extensions from body) and parapodia (Crawling, swimming, feeding, breathing)
Explain what is unique about the circulatory system of worms in Phylum Annelida versus Phylum Nematoda/Platyhelminthes.
Worms in Phylum Annelida were the first invertebrates to evolve a closed circulatory system.